Refactor the Docker entrypoint.sh

[haoel]

• Refactor the Docker entrypoint.sh
• typo fix for README
• gofmt -s for source file.

[codecov-commenter]

Codecov Report

Merging #569 (d8302c4) into main (b7c53be) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #569      +/-   ##
==========================================
- Coverage   78.67%   78.58%   -0.10%     
==========================================
  Files          95       95              
  Lines       10940    10940              
==========================================
- Hits         8607     8597      -10     
- Misses       1853     1860       +7     
- Partials      480      483       +3     

Impacted Files	Coverage Δ
pkg/cluster/cluster.go	53.06% <0.00%> (-1.89%)	⬇️
pkg/object/mqttproxy/client.go	80.54% <0.00%> (+0.90%)	⬆️

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